Display screen with a transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen with a transitional graphical user interface showing the new design;

FIG. 2 is the second image thereof; and,

FIG. 3 is the third image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1-3. The process or period in which an image transitions to another forms no part of the claimed design.

The broken line showing of the display screen is for environmental purposes only and forms no part of the claimed design. 

CLAIM The ornamental design for a display screen with a transitional graphical user interface, as shown and described. 